Core box



A. K. LAUKEL CORE' BOX Dec. l5, 1931.

original Filed Jah. 13, 1927 ATTORNY PatentedA Dec. 15, 1931 PATENT.OFFICE ARTHUR K. LATVJKEL, OF DETROIT, MICHIGAN CORE BOX Originalapplication led Ianiary 18, 1927, Serial No Vi929. Serial Thisapplication is a division of my'copending application Serial No.160,862, filed January 13, 1927. j

This invention relates to the manufacture of nietai core boxes bvelectro-deposition such as in the manner described in mypendmgapplication for Letters Patent of the Unit-ed States, Serial No.101,069, filed April 10,1926, and has for its object to provide in asimple iff manner for the special protection of sharp edges about thecavity of thevcore box so as s to increase their resistance wear underthe abraiding infiuence of core sand or similar material. `1

Generally for the sake of cheapness and expediency in electro-depositionit 1s pre-V i'erred to use copper as the metal of the core box, and asthis metal is somewhat soft, the sharp exposed edges thereof are more orless e easily burred over at the face or parting line orp the box, andto resist thistendency to burr at such edges I propose to provide theJcore box with a. face of hard metal extending to the outlines of thecavity of the box and thereby protecting the aforesaid exposed edges. Itis also proposed to provide such hard metal face by means ofelectro-deposition in the process of manufacturing the core box, andaiso to effect the electro-deposition of such hard metal upon apreviously deposited 61m oi' copper which issubsequently removed fromthe hard metal in the cleaning up of the finished core box. l

The invention is Jfully disclosed by way of l example in the followingdescription and in the accompanying drawings in which Figure 1 is anelevation of a mold used in the electrolytic production of a core box;

Figure 2 isa transverse section of the same; Figure 3 is a similartransverse section iliustrating a mold with a face plate applied theretoand a plate of hard metal depositedV on the mold at the required place;

Figure 4 is a similar view of Figure 1,

. 160,862. Divided and this application led May 23, No. 365,843.

illustrating the condition of the -mold` according to Figure 3;

Figure 5'is a transverse section of the mold after all ofthe platingoperations are com- P ete;

Figure 6 is a perspective view illustrating the electro-deposited corebox removed from the mold; and

Figure 7 is afragmentary de tail sectional view illustrating amodification of the process. uw

Reference to these views will now be made by use of likecharacterswhichare employed to designate corresponding parts throughout.

The numerall indicates a mold comprising a base 2 on the face of whichprojects a pattern 3 for the formation of the cavity of a core box, andaccording to an arrangement which I havewfound very satisfactory, theface of the moldis recessed as at 4 vfor the reception of a face plate 5of brass or Similar rigid material, the inner margin 4a of the saidrecess 4 roughly following the outline of the projecting pattern 3.

The said mold is prepared for plating by providing a conductive surface6 on the mold immediately surrounding the pattern 3 as indicated inFigure V2, this being preferably done before the application of the faceplate 5 to the mold so that theinner margins ofA lthe face plate willoverlap the said conductive surface, On this surface I thenelectrolytically deposit a plate of metal of a wear resisting y qualitycomparative to the principal metal of which the electro-deposited partsof the core box are to be `made. Thus, where the electro-depositedcore'l box is to Vbe of copper the electro-deposited plate referred tomay be of nickel. This is indicated by the reference numeral 7 'It willbe observed that Athis plate of nickel of wear resisting metal extendsfrom the inner margins of the face i plate V5 to and into the anglesbetween the pattern proper 3 of the lmold and the base 2 thereof.V 'i

Following this the pattern proper `3 is 9 place 5 and the edges of thecavity of the core box is the marginal film of hard metal so that thesharp edges are of a wear resisting nature and much less likely lto bedamaged or burred by the action of core sand being rammed into the corebox.

"According to Figure 7 the depositing of the Wear resisting metal isfirst proceeded by a fiashingvlO of copper or other metal adapted toform a specially suitable surface for the depositing of such Wearresisting metal, for

instance, Where the conducting surfaceof the mold is of silver sulphide,there may ordinarily be a tendency of nickel to become detachedtherefrom or peal, and to prevent this an "initial fiashing of copper isdeposited on the sulphide surface, to which flashing the nickel willadhere much more closely. The flashingA may be readily removed ifnecessary or desirable from the surface of nickel after Vthe removal ofthey shell from the mold A longer Wearing core box may be secured inthemanner described, with little difficulty, and the said inventionovercomes one of the objections sometimes met with in the use of"electro-deposited'copper core boxes Where they are utilized in highproduction Work and subjected to abuse in the making of cores therefrom.

Although specific embodiments of the in- 4'vention have been illustratedand described,

it will be understood that various alterations in the details ofconstruction may be made Without departing from the scope of theinvention as indicated by the appended claims.

` What IV claim is:

1.` In a metal core box having a molding face defining a cavity, a faceplate surrounding said cavity, a Wear piece of a relatively hard metalembedded in said face plate at the margin of said cavity and extendingto the Wall of said cavity, the remainder of said molding face being ofa less hard metal.

2. In a metal core box having a molding face defining a cavity, a faceplate surrounding said cavity, a Wear piece of a relatively hard metalembedded in said face plate at the margin of said cavity and extendingto Y,the wall of said cavity, the remainder of lsaid molding face beingof aless hard metal,

the face and Wear piece being bonded together at all points of contact.

3. In a metal core box having a molding face defining a cavity, a faceplate surrounding said cavity, a Wear piece of a relatively hard metalembedded in said face plate at the margin of said cavity and extendingto the Wall of said cavity, the remainder of said molding face being ofa less hard metal, the face and Wear piece being electrolytically bondedtogethervat all points of contact.

In Witness whereof I have hereunto set my hand.

ARTHUR K. LAUKEL.

